Mandating that people use a specific brand of oil to protect warranty is illegal under the tie-in sales provisions of the Magnuson-Moss Act of 1975. They can require that the oil you use meets a standard but that's it. Just because it doesn't have a GM logo on it doesn't mean they can automatically void your warranty.

I first looked this up years ago when someone told me that I would void the warranty on my Harley if I didn't use their oil.

Mandating that people use a specific brand of oil to protect warranty is illegal under the tie-in sales provisions of the Magnuson-Moss Act of 1975. They can require that the oil you use meets a standard but that's it. Just because it doesn't have a GM logo on it doesn't mean they can automatically void your warranty.

I first looked this up years ago when someone told me that I would void the warranty on my Harley if I didn't use their oil.

What's really silly, every Amsoil 5W-30 grade SS, XL, and OE all surpass the Dexos1 requirements, yet because Amsoil refuses to pay GM for this stupid certification that is honestly a downgrade spec to Amsoil, people here think that Amsoil will not work well in their GM engine.[/QUOTE]

Very good points you have, that is why is so important for a person to do research and learn the benefits of group 4 PAO oils and the superb benefits.
I will be bringing more data to process that AMSOIL exeeds the GM requirements hands down,

Mobil 1 Extended Performance and Mobil 1 oil filter Only can get the Mobil 1 filters at Advance Auto parts in our area. They have on sale for $10 each right now. Thats 50% off. just picked up a couple more!!!

Anybody run Shell Rotella T6 5w40 full synthetic? I'm ready to get flamed on this one but I've ran it in my bikes (both current and past) for over 20,000miles and I am not gentle on them. Many friends that have drag cars run it with good results as well.

Very good points you have, that is why is so important for a person to do research and learn the benefits of group 4 PAO oils and the superb benefits.
I will be bringing more data to process that AMSOIL exeeds the GM requirements hands down,

Don't know of the AMSOIL long term effect on these engines but when I switched from Mobil 1 to AMSOIL 5w-30 XL I noticed better cold starts even in 15 degree F temps and better performance as well. I know that factory stuff you guys are getting for $5 is literally crap and the first oil change after 4000 miles with my previous L99 it felt like sludge compared to the used Mobil 1 and AMSOIL.

Just changed my oil at 17k miles and made the switch to Royal Purple, manual tranny and rear diff are next for the RP swap out. I went with the K&N oil filter as everybody was sold out of the RP oil filters. I will order online and stock up on them and be completely RP very soon.

I do my own oil change sometimes and it does cost less,the problem is getting the car high enough to do it and dealing with the mess but you know it was done right,as far as oil brand I think they're mostly the same but I have been using M1 syn and bosch filter and change oil&filter every 5K,which I think is the most important thing is regular changes and maint.

I was just told by another member(scott@bjorn3d) that he changed to Pennzoil platinum and the ticking noise that you hear in the SS motors with the auto stopped. I just bought some and will be trying in the spring when I get her back out.